. >> reporter: with that harry reid and mitch mcconnell launched a latch-dimp effort to craft a bipt plan to that stop the tax hike going into effect on new year's day. they negotiated all day saturday. saturday night there was an offer. by this morning, a clear sense of optimism and warnings that failure would be unthinkable. >> there are no breakthroughs yet, but there's a real possibility of a deal. >> if we are not able to reach an agreement, it will be dire. >> the morning's optimism turned into the afternoon's pessimism. the senate opened for business at 1:00 p.m. with the ominous prayer from the chaplain. >> look with favor on our nation and save us from self-inflicted wounds. >> reporter: soon democratic leader reed acknowledged he had not been able to make a counteroffer to republicans. >> it's just that we're apart on some pretty big issues. >> frustrated with the impasse, republican mcconnell said he called vice president biden, urging him to get involved. >> i'm concerned about the lack urgency here. i want erch to know i'm willing to get this done, but i need a dance par